Arbalest (also designated as Unit alpha-theta-sigma /4-15-10) is a member of the Exilarchy of Cogs. When the elves, humans and cogs decided to meet to talk about the Lunar crisis, it was Arbalest who was sent to represent the Cogs. Later, when Randus Duthane returned to the Exilarchy of Cogs, Arbalest helped him to improve his new robotic arm.

Arbalest rides around on tank treads and looks to be a mix of old and new parts as he never stops upgrading.